CN111313207B - Design and manufacturing method applied to ReBCO multi-strip superconducting cable joint terminal - Google Patents
Design and manufacturing method applied to ReBCO multi-strip superconducting cable joint terminal Download PDFInfo
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- CN111313207B CN111313207B CN202010110941.6A CN202010110941A CN111313207B CN 111313207 B CN111313207 B CN 111313207B CN 202010110941 A CN202010110941 A CN 202010110941A CN 111313207 B CN111313207 B CN 111313207B
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- 238000013461 design Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 50
- 239000000126 substance Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 23
- 238000012545 processing Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000002356 single layer Substances 0.000 claims description 8
- 238000011056 performance test Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims 1
- 238000005476 soldering Methods 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 12
- 239000010949 copper Substances 0.000 description 12
- 239000004020 conductor Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910020073 MgB2 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/18—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing bases or cases for contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Or Oil Filled Cable Accessories (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a design and a manufacturing method of a connector terminal applied to a ReBCO multi-strip superconducting cable. In addition, the operation is simple, and the problems that the superconducting tape is easy to cause local damage and the superconducting property of the superconducting tape is damaged in the manufacturing process of the joint terminal are solved.
Description
Technical Field
The invention belongs to the technical field of cables, and relates to a design and manufacturing method of a joint terminal of a superconducting cable applied to a second-generation high-temperature superconducting tape (ReBCO), in particular to a design and manufacturing method of a joint terminal structure of a superconducting cable consisting of a plurality of ReBCO superconducting tapes in a performance test analysis process, so that the superconducting cable has the characteristics of low joint resistance and high current distribution uniformity between tapes.
Background
The second generation coated conductor ReBCO has a high critical temperature, critical current density and upper critical magnetic field, and is considered as one of potential materials for application to high-field magnets above next generation kiloampere level. At present, the adhesive is mainly applied in a strip form and has anisotropy. The structural design and application difficulty of the superconducting cable is aggravated by the anisotropic characteristic of the strip. Meanwhile, for the cable structure design of the ReBCO superconducting tape, a superconducting flat tape continuous transposition (Roebel) composite conductor, a superconducting Twisted Stack (TSTC) composite conductor, a spiral composite conductor (CORC) and the like are currently accepted to a high degree. In the process of testing and analyzing the performance of the ReBCO superconducting cable composed of multiple strips, a transition joint is needed to realize the transition transmission of current from the lead to the superconducting cable. The transition joint directly influences the current distribution condition among the superconducting tapes in the tested cable, and the misjudgment of the cable performance caused by local quench or the damage of the cable can be caused inevitably under the condition of nonuniform current distribution. Therefore, for the ReBCO superconducting cable composed of multiple tapes, the joint terminal is one of the key components to evaluate its performance.
Current round wire superconducting cables (e.g. NbTi, Nb)3Sn，Bi2212，MgB2Etc.) the manufacturing process of the joint terminal is mature in the test process, the method of copper bar slotting and superconducting cable soldering is mainly adopted, the limit range of the temperature of the round wire superconducting cables in the soldering process is wide (generally controlled below 500 ℃ above the melting point of soldering tin), the soldering process of the joint manufacturing is simple, and the gap between the superconducting cable and the copper slot can be filled with the soldering tin by controlling the higher temperature, so that the resistance value of a single joint terminal is 10 under the operation working condition (-4.2K) generally-13~10-14Between ohms.
However, ReBCO coated conductors are a multi-layer thin strip structure, as shown in fig. 1, typically including a metal stabilizer layer (e.g., a copper stabilizer layer), a silver protective layer, a superconducting layer, a buffer layer, and a substrate layer. The composite structure of the ReBCO superconducting tape brings certain difficulties to the design and manufacture of the joint terminal of the superconducting cable. In order to analyze the performance of the multi-strip ReBCO superconducting cable, fig. 2(a), (b) and (c) schematically illustrate a typical processing method of a multi-strip ReBCO cable joint terminal at present. The structure (a) is mainly characterized in that a conical or square copper bar is processed, and then each ReBCO superconducting strip is soldered or pressed on the copper bar, so that the fixing and current transmission effects are achieved; fig. 2(b) and (c) show the typical current round and square cable connector terminals, respectively, which are made by integrating the ends of multi-strip cables with solder or other high conductivity material and then tightly fitting them into corresponding shaped slots in the copper busbar. The structure diagram 2(a) is relatively complex in operation, and particularly after the number of the strips exceeds a certain value, the strips at the root of the terminal are easily subjected to local strain to cause performance degradation; fig. 2(b) and (c) are subjected to current transmission from the outside to the inside, which, although the current can be transmitted between the filled solders or other highly conductive substances, leads to high joint resistance and uneven current distribution between different superconducting tapes. In addition, the high joint resistance generates a large amount of heat, which in turn affects the current-carrying performance of the entire cable.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for designing and manufacturing a joint terminal suitable for ReBCO multi-strip superconducting cables, so that the joint terminal is suitable for electrical performance test analysis of multi-strip ReBCO superconducting cables with various structures. The mode of carrying out the layering processing on the multiple strips is mainly adopted, and compared with the design of the existing typical mode joint terminal, the design of the joint terminal enables the current to directly enter each ReBCO superconducting strip through a joint terminal cover plate or a base and a high-conductivity object, and the uniform distribution of the current among different strips is facilitated. In addition, the manufacturing process avoids a local vulnerable structure including a root, the problem that mechanical damage is easy to occur in the manufacturing process of the joint terminal of the multi-strip ReBCO superconducting cable to cause the decline of electrical performance is solved, the manufacturing process is not limited by the number of strips, and the operation is simple and convenient.
The invention provides a design method applied to a ReBCO multi-strip superconducting cable joint terminal, which is characterized by comprising the following steps:
step 1, two end parts of a multi-strip ReBCO superconducting cable composed of ReBCO superconducting strips adopt a step-shaped layered structure, the number of layers is distributed according to the number of the strips and the length of a joint terminal allowed by test equipment, the length of each layer is more than or equal to 10mm, the number of wound or stacked layers of the ReBCO superconducting strips in the superconducting cable is N, and the number of wound or stacked layers of the superconducting strips at the joint part of the end part of the cable is designed into N steps according to the number of wound or stacked layers of the superconducting strips;
step 2, designing a base and cover plate assembly structure with a terminal for current lead connection adopted by current input in the performance test process of the superconducting cable;
step 3, designing a base, namely slotting on the upper end face of a cuboid block for fixing the end part of the ReBCO superconducting cable, wherein the cross section of the slot is semicircular, U-shaped or square, the slot is designed into a step structure in the length direction, the length of the step structure is determined according to the length of each layer of steps or the accumulated length of adjacent layers at the end part of the cable, the radius or the width of the slot is larger than the outer diameter or the width of the cable, and the depth of the square or U-shaped slot is required to be larger than the diameter/thickness of the cable;
step 4, carrying out corresponding cover plate structure design based on the base, wherein if the base adopts a semicircular groove structure, the corresponding position of the cover plate also adopts the same semicircular groove structure, and if the base adopts a square or U-shaped groove structure, the cover plate is of a flat plate structure and does not need to carry out groove structure design;
step 5, the joint terminal part of the ReBCO superconducting cable in the step 1 is assembled with a terminal base and a cover plate through grooves in the base and the cover plate, and the positions of the grooves in the base are determined according to the connection state of current leads;
step 6, the base and the cover plate are fixedly installed in a threaded connection mode, the base is provided with a threaded hole, and the cover plate is of a through hole structure;
step 7, filling assembling gaps between the terminal base, the cover plate and the superconducting cable with high-conductivity substances;
step 8, in order to facilitate the filling treatment of the high-conductivity substances, through groove/through hole structures are designed at positions on the cover plate corresponding to the base grooves, the number of the through grooves/holes is selected from one or more through grooves/holes according to the length of the whole cover plate, and the connecting distance between two end parts of the cover plate and the through holes/through grooves needs to be larger than a preset length threshold value so as to avoid the influence of processing deformation; the channel width/via diameter needs to be smaller than the cable width/diameter.
The invention also provides a manufacturing method applied to the ReBCO multi-strip superconducting cable joint terminal, which comprises the following steps:
step 1, processing two ends of a superconducting cable consisting of a plurality of ReBCO superconducting strips, and measuring and obtaining the initial and terminal positions of each layer of a joint terminal part according to the number of the strips and the length of the joint terminal allowed by a test device;
step 2, fixing the tail ends of the ReBCO superconducting tapes on the step lengths of all layers, and removing redundant superconducting tapes on the lengths except the tail ends;
3, filling high-conductivity substances among the multiple ReBCO superconducting tapes to meet the requirements of current transmission and connection fixation among the tapes, wherein the melting point of the high-conductivity filling material is less than or equal to 220 ℃;
step 4, performing structure fixing pretreatment on the step parts at the two end parts of the multi-strip superconducting cable by adopting a high-conductivity substance;
step 5, assembling the terminal base, the cover plate and the superconducting cable in a high-conductivity substance filling assembly mode to ensure that the terminal base, the cover plate and the superconducting cable play a role in mechanical fixation and low-resistance current transmission;
furthermore, during the design and treatment process of the two ends of the superconducting cable, a single or a plurality of superconducting strips are placed on the single-layer step in the step structure.
Furthermore, the stepped structure parts at the two ends of the cable are fixed by high-conductivity substances and are subjected to heating and melting pretreatment after being fixed.
Further, the size of the through groove or the step groove on the terminal base or the cover plate is determined by the size of the superconducting cable, and the step length is the length of a single layer or multiple adjacent layers of the superconducting cable.
Furthermore, the number of the through grooves/through holes in the terminal cover plate is one or more according to the length of the specific joint terminal, so that the whole strength of the cover plate is ensured, meanwhile, enough space is ensured for subsequent high-uniformity low-porosity filling of high-conductivity substances, and the high-conductivity substances are filled through the through grooves/through holes.
Furthermore, the fixing mode among the joint terminal base, the cover plate and the superconducting cable is a mode of high-conductivity substance fusion connection with the melting point less than or equal to 220 ℃ or close fit through high-plasticity high-conductivity filler;
furthermore, the base of the joint terminal and the cover plate are combined by adopting a bolt connection or welding mode.
The invention also provides a connector terminal applied to the ReBCO multi-strip superconducting cable, which is characterized by comprising the following components:
a square base and a cover plate;
the base comprises a groove which is formed in the upper end face of a cuboid block, wherein the cross section of the groove is semicircular, U-shaped or square, the groove is designed to be of a step structure in the length direction, the length of the step structure is determined according to the length of each layer of steps at the end part of a cable or the accumulated length of adjacent layers, the radius or the width of the groove is larger than the outer diameter or the width of the cable, and the depth of the square or U-shaped groove is required to be larger than the diameter/thickness of the cable;
the cover plate is matched with the base, if the base adopts a semicircular groove structure, the corresponding position of the cover plate also adopts the same semicircular groove structure, and if the base adopts a square or U-shaped groove structure, the cover plate is of a flat plate structure;
the joint terminal part of the superconducting cable is combined and assembled with the terminal base and the cover plate through the grooves on the base and the cover plate;
the base and the cover plate are fixedly connected through threads, the base is provided with a threaded hole, and the cover plate is of a through hole structure;
and assembling gaps among the terminal base, the cover plate and the superconducting cable are filled with high-conductivity substances.
The invention has the advantages that:
in order to meet the requirement of the joint terminal for electrical performance test and analysis of the ReBCO multi-strip superconducting cable, the invention designs a mode of assembling the end part of the superconducting cable with a high-conductivity base and a cover plate after step processing, and finally filling a high-conductivity substance into an assembly gap, thereby effectively improving the current distribution condition of the joint terminal of the ReBCO multi-strip superconducting cable and greatly reducing the joint resistance. In addition, the operation is simple, and the problems that the superconducting tape is easy to cause local damage and the superconducting property of the superconducting tape is damaged in the manufacturing process of the joint terminal are solved.
Drawings
FIG. 1 is a schematic view of a structure of a conventional ReBCO superconducting tape;
fig. 2(a) is a schematic view of a joint terminal of a layer-by-layer soldering structure of ReBCO superconducting tapes on a typical existing copper bar/copper cone terminal;
FIG. 2(b) is a schematic view of a conventional integral soldering structure of a ReBCO cylindrical cable;
FIG. 2(c) is a schematic view of a conventional joint terminal of the integral soldering structure of a ReBCO stacked square cable;
fig. 3(a) is a schematic view of a circular cable end processing applied to a ReBCO multi-tape superconducting cable joint terminal of the present invention;
fig. 3(b) is a schematic view of a square cable end processing applied to a ReBCO multi-tape superconducting cable joint terminal according to the present invention;
fig. 4(a) is a schematic view of a circular/U-shaped groove base applied to a ReBCO multi-tape superconducting cable joint terminal of the present invention;
fig. 4(b) is a schematic view of a square groove base applied to a ReBCO multi-tape superconducting cable joint terminal of the present invention;
fig. 5(a) is a schematic view of a semicircular slot cover plate applied to a joint terminal of a ReBCO multi-tape superconducting cable according to the present invention;
fig. 5(b) is a schematic view of a flat plate type cap plate applied to a tab terminal of a ReBCO multi-tape superconducting cable according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
Referring to the drawings, fig. 1 is a schematic structural view of a conventional ReBCO superconducting tape, which includes a stabilizing layer, a silver protective layer, a superconducting layer, a buffer layer and a substrate layer;
fig. 2(a) is a schematic view of a joint terminal of a layer-by-layer soldering structure of ReBCO superconducting tapes on a typical existing copper bar/copper cone terminal; FIG. 2(b) is a schematic view of a conventional integral soldering structure of a ReBCO cylindrical cable; fig. 2(c) is a schematic view of a joint terminal of a conventional ReBCO stacked rectangular cable integral soldering structure.
According to an embodiment of the present invention, the present invention provides a design method applied to a ReBCO multi-tape superconducting cable joint terminal, including the steps of:
step 1, two end parts of a multi-strip ReBCO superconducting cable composed of ReBCO superconducting strips adopt a step-shaped layered structure, the number of layers is distributed according to the number of the strips and the length of a joint terminal allowed by a test device, the length of a single layer is more than or equal to 10mm, for example, as shown in fig. 3(a) and (b), the number of wound or stacked layers of the ReBCO superconducting strips in the superconducting cable is 3, and the superconducting strips at the joint part of the end part of the cable can be designed into three steps according to the number of wound layers.
Step 2, selecting a high-conductivity (such as high-purity oxygen-free copper with a residual resistance ratio of more than 100) block material as a terminal material for connecting a current lead adopted by current input in the process of testing the performance of the superconducting cable, and in addition, in order to facilitate the installation of the terminal material and the end part of the ReBCO superconducting cable in the step 1, adopting a base and cover plate assembly structure for the terminal design;
step 3, designing a base as shown in fig. 4(a) and (b), and slotting on the upper end face of the rectangular block material for fixing the end part of the ReBCO superconducting cable in step 1, wherein the slot can be in a semicircular, U-shaped or square step structure, the step structure design is carried out according to the step length of each layer or the accumulated length of adjacent layers of the cable end part in step 1, the radius or width of the slot should be slightly larger than the outer diameter or width of the cable, and for convenience of operation, the depth of the square or U-shaped slot needs to be slightly larger than the diameter/thickness of the cable. FIG. 4(a) shows a semi-circular or U-shaped slot terminal base schematic, and FIG. 4(b) shows a square slot terminal base schematic;
and 4, designing a cover plate structure according to the base in the step 3, as shown in fig. 5(a) and (b), if the base adopts a semicircular groove structure, the corresponding position of the cover plate also needs to be provided with the same semicircular groove structure, which is shown in fig. 5(a), and if the base adopts a square or U-shaped groove structure, the cover plate can be of a flat plate structure, which is shown in fig. 5(b), and the groove structure design is not needed.
Step 5, the joint terminal part of the ReBCO superconducting cable in the step 1 is assembled with the terminal base and the cover plate through the grooves on the base and the cover plate, so that the base groove in the step 3 can be positioned at any position on the upper surface of the cuboid block material and is specifically determined according to the connection state of the current lead;
step 6, the base and the cover plate are fixedly installed and connected through threads, the base is provided with a threaded hole, and the cover plate is provided with a through hole structure;
step 7, adopting a high-conductivity substance (such as Sn) in the assembly gap of the terminal base, the cover plate and the superconducting cable63Pb37) Filling;
step 8, in order to facilitate the filling treatment of the highly conductive substance, the design of the position on the cover plate corresponding to the base groove adopts a through groove/through hole structure, as shown in fig. 5(a) and (b), the number of the through grooves/holes can be selected from a single or multiple through grooves/through holes according to the length of the whole cover plate, and the connection distance between the two end portions of the cover plate and the through holes/through grooves needs to ensure enough length to avoid the influence of processing deformation. The width/diameter of the through groove is required to be smaller than that of the cable;
the invention also provides a manufacturing method applied to the ReBCO multi-strip superconducting cable joint terminal, which is characterized by comprising the following steps of:
step 1, processing two ends of a superconducting cable consisting of a plurality of ReBCO superconducting strips, and measuring and obtaining the initial and terminal positions of each layer of a joint terminal part according to the number of the strips and the length of the joint terminal allowed by a test device;
step 2, fixing the tail ends of the ReBCO superconducting tapes on the step lengths of all layers, and removing redundant superconducting tapes on the lengths except the tail ends;
step 3, adopting high-conductivity substances (such as Sn) between multiple ReBCO superconducting tapes63Pb37) Filling to meet the requirements of current transmission and connection fixation among the strips, wherein the melting point of the high-conductivity filling material is less than or equal to 220 ℃;
step 4, carrying out structure fixing pretreatment (for example, Sn can be adopted) on the step parts (shown in the parts (a) and (b) of the two end parts of the multi-strip superconducting cable) by adopting high-conductivity substances63Pb37Welding and fixing the step parts of the ReBCO superconducting strips);
step 5, assembling the terminal base, the cover plate and the superconducting cable in a high-conductivity substance filling assembly mode to ensure that the terminal base, the cover plate and the superconducting cable play a role in mechanical fixation and low-resistance current transmission;
during the design and treatment process of the two ends of the superconducting cable, a single layer of step in the step structure can be used for placing a single or a plurality of superconducting strips;
the step structure parts at the two ends of the cable can be fixed by high-conductivity substances (such as soldering tin) and are subjected to heating and melting pretreatment after being fixed;
the structure of the groove on the terminal base and the cover plate is arbitrary, can be square or round, and can be selected according to the specific shape of the ReBCO multi-strip superconducting cable;
the size of the through groove or the step groove on the terminal base or the cover plate is determined by the size of the superconducting cable, and the step length can be the length of a single layer of the superconducting cable or the length of multiple adjacent layers of steps;
the number of the through grooves/through holes on the terminal cover plate can be one or more according to the length of a specific joint terminal, so that the integral strength of the cover plate is ensured, meanwhile, enough space is ensured for subsequent high-uniformity low-porosity filling of high-conductivity substances, and the high-conductivity substances are filled through the through grooves/through holes;
the fixing mode among the base, the cover plate and the superconducting cable of the joint terminal can be a mode of melting connection of high-conductivity substances (the melting point is less than or equal to 220 ℃) or a mode of tight fit through high-plasticity high-conductivity fillers (such as indium);
the base of the joint terminal and the cover plate can be combined by adopting a bolt connection or welding mode;
as shown in fig. 3(a), (b) and fig. 4(a), (b), according to another embodiment of the present invention, a method for manufacturing a tab terminal of a ReBCO multi-tape superconducting cable is provided, which includes the following steps:
step 1, determining the total length of step parts at two ends of a cable according to the number (layers) of superconducting tapes contained in the ReBCO superconducting cable, wherein the length of a single-layer step is more than or equal to 10mm, and the total length of the step parts is 200-400 mm; optionally, a plurality of layers (more than 3 layers) of wound ReBCO superconducting tapes with the width of 1-6mm and the thickness of 0.05-0.2mm are adopted, and each layer is a superconducting cable with 2-5 superconducting tapes;
step 2, determining the structural design of a terminal base and a cover plate according to the sizes of step parts at two end parts of the cable and the connection structure of the step parts and the corresponding current leads, wherein the number of grooves/holes on the cover plate can be specifically selected according to the length of the terminal, and the width of the grooves can be determined according to the size of the cable, so that the grooves are generally smaller than the overall size of the cable;
optionally, in order to meet the requirement that current is uniformly distributed among the layers of superconducting tapes in the electrifying process, the superconducting tapes inside the cable joint are designed to be of a step structure, and the length of each step needs to be calculated according to the cable structure, the length of a cable in the joint and the size of a copper joint, so that the end parts of the layers of superconducting tapes are exposed outside;
step 3, processing the terminal base and the cover plate by adopting a high-conductivity material;
step 4, processing the step parts at two end parts of the ReBCO superconducting cable, firstly, fixing the superconducting tapes at the end parts of the steps according to the step length design of the outermost layer in the step (1), removing the redundant ReBCO superconducting tapes on the length of the layer, and sequentially processing the layers one by one until the step is the innermost layer;
step 5, preprocessing the step parts at the two end parts of the ReBCO superconducting cable, and performing heating melting preprocessing by adopting high-conductivity substances such as soldering tin and the like or performing tight wrapping processing by adopting the high-conductivity substances;
step 6, assembling the end part of the ReBCO superconducting cable, the terminal base and the cover plate, filling high-conductivity substances in the gap,
and 7, filling a molten high-conductivity substance into the groove/hole structure on the cover plate to fix and strengthen the joint terminal, wherein the melting point of the high-conductivity filling substance is less than or equal to 220 ℃.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (6)
1. A design method applied to a ReBCO multi-strip superconducting cable joint terminal is characterized in that the end of a superconducting cable is assembled with a high-conductivity base and a cover plate after being processed in a step mode, and finally, a mode of filling high-conductivity substances in an assembly gap is adopted, and the design method specifically comprises the following steps:
step 1, two end parts of a multi-strip ReBCO superconducting cable composed of ReBCO superconducting strips adopt a step-shaped layered structure, the number of layers is distributed according to the number of the strips and the length of a joint terminal allowed by test equipment, the number of wound or stacked layers of the ReBCO superconducting strips in the superconducting cable is N, and N is more than or equal to 3; the superconducting tape at the joint part of the cable end is designed into N steps according to the winding or stacking number of layers; a plurality of superconducting tapes are placed on the single-layer steps in the step structure;
step 2, designing a base and cover plate assembly structure with a terminal for current lead connection adopted by current input in the performance test process of the superconducting cable;
step 3, designing a base, namely slotting on the upper end face of a cuboid block for fixing the end part of the ReBCO superconducting cable, wherein the cross section of the slot is semicircular, U-shaped or square, the slot is designed to be of a step structure in the length direction, the length of the step structure is determined according to the length of each layer of steps at the end part of the cable, the radius or the width of the slot is larger than the outer diameter or the width of the cable, and the depth of the square or U-shaped slot is required to be larger than the diameter/the thickness of the cable;
step 4, carrying out corresponding cover plate structure design based on the base, wherein if the base adopts a semicircular groove structure, the corresponding position of the cover plate also adopts the same semicircular groove structure, and if the base adopts a square or U-shaped groove structure, the cover plate is of a flat plate structure and does not need to carry out groove structure design;
step 5, the joint terminal part of the ReBCO superconducting cable in the step 1 is assembled with a terminal base and a cover plate through grooves in the base and the cover plate, and the positions of the grooves in the base are determined according to the connection state of current leads;
step 6, the base and the cover plate are fixedly installed in a threaded connection mode, the base is provided with a threaded hole, and the cover plate is of a through hole structure;
step 7, filling assembling gaps between the terminal base, the cover plate and the superconducting cable with high-conductivity substances;
step 8, in order to facilitate the filling treatment of the high-conductivity substances, through groove/through hole structures are designed at positions on the cover plate corresponding to the base grooves, the number of the through grooves/holes is selected from one or more through grooves/holes according to the length of the whole cover plate, and the connecting distance between two end parts of the cover plate and the through holes/through grooves needs to be larger than a preset length threshold value so as to avoid the influence of processing deformation; the channel width/via diameter needs to be smaller than the cable width/diameter.
2. A manufacturing method applied to a ReBCO multi-strip superconducting cable joint terminal is characterized by comprising the following steps:
step 1, processing two ends of a superconducting cable consisting of a plurality of ReBCO superconducting strips, and measuring and obtaining the initial and terminal positions of each layer of a joint terminal part according to the number of the strips and the length of the joint terminal allowed by a test device;
step 2, fixing the tail ends of the ReBCO superconducting tapes on the step lengths of all layers, removing redundant superconducting tapes on the lengths except the tail ends, and forming step structures at two end parts; in the process of designing and processing two ends of the superconducting cable, a plurality of superconducting strips are placed on a single-layer step in the step type structure;
3, filling a plurality of ReBCO superconducting strips with a high-conductivity substance to meet the requirements of current transmission and connection fixation among the strips, wherein the melting point of the high-conductivity filling material is less than or equal to 220 ℃;
step 4, performing structure fixing pretreatment on the step parts at the two end parts of the multi-strip superconducting cable by adopting a high-conductivity substance;
step 5, assembling the base, the cover plate and the superconducting cable by adopting a high-conductivity substance filling assembly mode,
the base of the joint terminal and the cover plate are combined by adopting a bolt connection or welding mode;
the base is arranged in a way that a groove is formed in the upper end face of a cuboid block and used for fixing the end part of a ReBCO superconducting cable, wherein the cross section of the groove is semicircular, U-shaped or square, the groove is designed to be of a step structure in the length direction, the length of the step structure is determined according to the length of each layer of steps at the end part of the cable, the radius or the width of the groove is larger than the outer diameter or the width of the cable, and the depth of the square or U-shaped groove is required to be larger than the diameter/the thickness of the cable;
the cover plate is arranged in such a way that if the base adopts a semicircular groove structure, the corresponding position of the cover plate also adopts the same semicircular groove structure, and if the base adopts a square or U-shaped groove structure, the cover plate is of a flat plate structure;
the terminal part is assembled with the base and the cover plate through the grooves on the base and the cover plate.
3. The method as claimed in claim 2, wherein in step 4:
the stepped structure parts at two ends of the cable are fixed by high-conductivity substances and are subjected to heating and melting pretreatment after being fixed.
4. The method as claimed in claim 2, wherein in step 5:
the number of the through grooves/through holes in the terminal cover plate is set to be one or more according to the length of a specific joint terminal, so that when the overall strength of the cover plate is ensured, the follow-up high-uniformity low-porosity filling of high-conductivity substances is ensured to be carried out in enough space, and the high-conductivity substances are filled through the through grooves/through holes.
5. The method as claimed in claim 2, wherein in step 5:
the fixing mode among the base of the joint terminal, the cover plate and the superconducting cable is a mode of melting connection of high-conductivity substances with the melting point less than or equal to 220 ℃ or tight fit through high-plasticity high-conductivity fillers.
6. A joint terminal applied to a ReBCO multi-tape superconducting cable manufactured by the method of any one of claims 2 to 5, comprising:
a square base and a cover plate;
the base comprises a groove which is formed in the upper end face of a cuboid block, wherein the cross section of the groove is semicircular, U-shaped or square, the groove is designed to be of a step structure in the length direction, the length of the step structure is determined according to the length of each layer of steps at the end part of a cable, the radius or the width of the groove is larger than the outer diameter or the width of the cable, and the depth of the square or U-shaped groove is required to be larger than the diameter/the thickness of the cable;
the cover plate is matched with the base, if the base adopts a semicircular groove structure, the corresponding position of the cover plate also adopts the same semicircular groove structure, and if the base adopts a square or U-shaped groove structure, the cover plate is of a flat plate structure;
the joint terminal part of the superconducting cable is combined and assembled with the terminal base and the cover plate through the grooves on the base and the cover plate;
the base and the cover plate are fixedly connected through threads, the base is provided with a threaded hole, and the cover plate is of a through hole structure;
and assembling gaps among the terminal base, the cover plate and the superconducting cable are filled with high-conductivity substances.
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| CN113036470B (en) * | 2021-03-17 | 2022-11-29 | 西部超导材料科技股份有限公司 | MgB2 superconducting cable joint and preparation and connection method thereof |
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| CN106848631A (en) * | 2017-01-16 | 2017-06-13 | 中国科学院合肥物质科学研究院 | A kind of superconducting conductor joints of Bi 2212 |
| JP2019161873A (en) * | 2018-03-14 | 2019-09-19 | 古河電気工業株式会社 | Superconducting cable terminal structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106848631A (en) * | 2017-01-16 | 2017-06-13 | 中国科学院合肥物质科学研究院 | A kind of superconducting conductor joints of Bi 2212 |
| JP2019161873A (en) * | 2018-03-14 | 2019-09-19 | 古河電気工業株式会社 | Superconducting cable terminal structure |
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